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Effects of argonitrogen dilution on explosion and combustion characteristics of dimethyl ether-air mixtures

机译：氩/氮稀释对二甲醚-空气混合物爆炸和燃烧特性的影响

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摘要

In this study, an investigation of the explosion parameters, which include maximum explosion pressure (p(max)), maximum rate of pressure rise (dp/dt)(max), and combustion characteristics, i.e., laminar burning velocity (S-L), activation temperature (T-a) and Zel'dovich number (Ze) of dimethyl ether (DME)-air-argo nitrogen mixtures are systematically carried out. The dilution effects on the explosion and combustion characteristics are also explored through the addition of two diluents, i.e., argon (Ar) and nitrogen (N-2), into the DME-air mixture. It is found from experiment that, the explosion parameters of fuel-lean and fuel-rich mixture exhibit different behaviors. For the fuel rich mixture, p(max) decreases with increasing amount of Ar and N-2 dilution, and a significant drop of (dp/dt)(max) is observed as the amount of added diluent increases. For the fuel lean mixture, p(max) is first increased with increasing diluent, afterwards it decreases as inert gas dilution ratio larger than a critical value, it is also found (dp/dt)(max) fluctuates with more addition of diluent. The present results also confirm that SL decreases more abruptly in the DME-air mixtures with dilution of N-2 than with Ar, which indicates that the increase in density dominates over the retarding effect for laminar burning velocity in the cases of inert gases dilution. The activation temperature of DME-air-Ar is larger than DME-air-N-2 at the same condition, which demonstrates N-2 dilution is more sensitive than N-2 on the suppression of chemical reaction. Results illustrate that Ze goes up with the increase of dilution ratio, and the values of Ze for argon diluted mixtures are larger than that of nitrogen diluted. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在这项研究中，研究了爆炸参数，包括最大爆炸压力（p（max）），最大升压速率（dp / dt）（max）和燃烧特性，即层流燃烧速度（SL），系统地进行了二甲醚（DME）-空气-argo n /氮混合物的活化温度（Ta）和泽尔多维奇数（Ze）。还通过在DME空气混合物中添加两种稀释剂（即氩气（Ar）和氮气（N-2））来探讨稀释对爆炸和燃烧特性的影响。从实验中发现，贫油和富油混合物的爆炸参数表现出不同的行为。对于富含燃料的混合物，随着Ar和N-2稀释量的增加，p（max）降低，并且随着稀释剂添加量的增加，（dp / dt）（max）会显着下降。对于贫燃料混合物，p（max）首先随着稀释剂的增加而增加，随后随着惰性气体稀释比大于临界值而降低，并且还发现（dp / dt）（max）随着稀释剂的添加而波动。目前的结果还证实，在稀释了N-2的DME空气混合物中，SL比用Ar急剧下降，这表明在惰性气体稀释的情况下，密度的增加在层流燃烧速度的阻滞作用上占主导地位。在相同条件下，DME-air-Ar的活化温度要高于DME-air-N-2的活化温度，这表明N-2稀释在抑制化学反应方面比N-2更为敏感。结果表明，Ze随稀释比的增加而增加，氩气稀释后的混合物的Ze值大于氮气稀释后的Ze的值。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2015年第1期|646-652|共7页
  • 作者

    Zhang Bo; Shen Xiaobo; Pang Lei;

  • 作者单位

    E China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;

    E China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;

    Beijing Inst Petrochem Technol, Beijing 102617, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dimethyl ether; Argonitrogen; Explosion parameters; Combustion characteristics;

    机译：二甲醚;氩/氮;爆炸参数;燃烧特性;

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